How can one set a pending order to get the best result

thanks for your concern, i am victor no too old in forex but new, i want your help as on how to set and use the pending order on mt4 trader-- i see buy limit, sell limit, sell stop and buy stop. i try setting trade but too much trouble on the broker i use instaforex.com. thing get to hard for my use here. i will be glade if you give me the best help. thanks every one and thanks to the great owner of babypips.com